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AC is the magnitude of sinosudial-wave but we use cose value to determine power factor instead of sine value.
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Answer Posted / sarmadahmed
SINE and COSINE are both sinusoidal. They essentially have same properties but different values at different time but both are sinusoids and every wave having similar properties will be a sinusoid too. And the cosine term is there because of some trigonometric calculations, it could be sine too. Have a look at power triangle and you'll get the answer.
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